The DYC Series 8200/8800 single hung thermally-broken aluminum windows have a remarkably low air infiltration rate of .03 CFM. This is FIVE times more airtight than the industry average of residential vinyl windows. Posted data from our competitors' websites show air infiltration rates for vinyl windows from .11 CFM to .21 CFM. It would take FIVE DYC 8200/8800 Series windows to leak as much air as ONE of the typical residential vinyl windows.

Our 8200/8800 Series windows are SEVEN times more airtight than the industry average of residential wood windows. Posted data from wood window websites show air infiltration rates from .12 CFM to .30 CFM. It would take SEVEN DYC 8200/8800 Series windows to leak as much air as one typical residential wood window.

Our ECO-BAN double weather-stripped interlock and sash coupled with double bulb seals at the sill make this DYC window extremely airtight. Excessive air infiltration contributes to heat gain/heat loss
that can result in higher energy costs for homeowners. Selecting windows with low air infiltration rates like our 8200/8800 Series can help reduce home energy costs as well as reduce pollens, dust and other pollutants.

This exclusive PolyPour DYC Window System is the workhorse of our product mix. From our first day in business, this thermally broken single hung, its full-screen and bevel-faced clone, and their companion slider and picture window have been very dependable performers. The windows in this System are made-to-order and built in custom sizes to meet your unique needs and are available in Silver, White, Tan, or Bronze. In addition to our Limited Lifetime Warranty, its most popular features include: